Tool-retainer for drilling-machines.



vw. E. EDWARDS. TOOL RETAINER FOR DRILLING MACHINES.

APPLICATION FILED NOV. 7. I916.

Patented June 12, 1917.

2 SHEETS-SHEET I.

/6 invg tur fi 1m EL Edwards Hi h W. E. EDWARDS. TOOL RETAINER FOR DRILLING MACHINES.

Pafentedjune 12 1917. I

2 SHEETS-SHEET 2.

APPLICATION FILED NOV- 7, 1916.

H15 Afin run: 5

UN TED STATES PATENT oFFIoEL war-mac a. nnwms, or eonnrmn, mans.

To all whom it may concern.

Be it known that I, WALMAC E. Eowanns,

a subject of the Kin of Great Britain, and a resident of Goldfie d, in the county of Esmeralda and State of Nevada, haveinvented a. certain new and useful Improvement in Tool-Retainers for Drilling-Machines, of which the, following is a specification.

' The present invention relates to an attachment to be applied to drilling machines for. holding the drill steels or tools in the socket when the drilling machine is tilted downwardly, or when the drilling tool is being extracted from a bore.

The drilling machines which are now commonly used, usually of the pneumatic type, are provided with spring muzzles or retaining yokes which engage the shanks of the tools, and which are held in engagement therewith b studs projecting lateralllygfrom the forwar head of the tool. The yo es are held in interlocking engagement with the tools by springs, the, latter frequently being compressed totheir full extent to release the yokes under the vibration of the toolwhen the latter is being extracted.

It is an object of the present invention to provide an attachment of this character which will prevent the accidental displace-v ment of the retaining yokes, and to provide a positive lock for holding the yokes about the tool under all conditions, the lock being readily releasable when it is desired to extract the tool.

It is the further aim of the present invention to provide an attachment of this character which may be applied to stock machines which are already manufactured, and which therefore does not necessitate any special formation of the barrel or forwa'rdhead of the drillin machine.

Other 0 jects and advantagesof this in vention, as well as those above enumerated, will be brought out more particularly in the followin detailed description of the present preferre embodiment 0 this invention, the same being illustrated in the accompanying drawings wherein:

Figure 1 is a side elevation of the outer end of a drilling tool, the tool retainer of the present invention bein a plied thereto.

Fig. 2 is an enlarge si e elevation of. the same, taken at right angles to the showing'in ig. 3 is an enlarged view similar to Fig.

Specification of Letters intent.

Application filed Iovenber 7, 1816. Serial Io. 180,058.

parts are desi moon-mam FOB DBlIIIaLIHG-IA Patented June 12, 1917.

1, showing in dotted lines the tilting of the retainin jaws to release the tool steel.

' Fig. 4 1s a side elevation ofthe outer end of a drilling tool with a modified form of the retainer of this invention a pliedthereto, the view showing-a latchlock or holding the retainer in place.

Fig. 5 is asimilar view showing the latch in its locking osition, the view also showing the socket en of the tool disengaged from the drilling machine.

Fig; is a detail perspective view of the front head of the drilling machine according to the modification shown in Fig. 5.

Fig. 7 is a detail perspective view, enlarged, of the retaining jaw of the resent invention according to the modi cation shown in Fig. 5. p Fig. 8 is a detail perspective view, enlarged, of the locking latch'which is applied as shown in Fi s. 4 and 5.

Fig. 9 is a side elevation of the outer or front head of a drilling machine,'showing a modified construction of the. tool retainer. Fig. 10 is a similar view, showing the retainer in releasing position, and showing the shank of the tool detached from the drilling machine.

Fig. 11 is a side elevation of the drilling machine having the tool retainer of Fig. .9 applied thereto, the figure being taken at right angles to the showing in Fig. 9.

Fig. 12 is a side elevation of the front head of the drilling machine, showing a modification in the mounting of .the pivot and retaining lugs carried by the barrel.

Fig. 13 is a detail! perspective view, enlarged, of one of the lug-carrying membersi Fig. 14 is a top plan view of one side of the front head of the drilling machine, showin one of the lug-carrying members applied thereto.

Referring to these drawings, wherein like of reference t roughout the several views, one form of the resent invention is shown in Figs. 1 to 7 inc usive, and wherein a drilling machine 10 is provided with the usual head 11 connected to the drilling machine b spring rods 12whioh slidably pass throu ears 13 project' from the inner end of the head .11, and whlch carry springs ;15 bearing against the ears 13 to resiliently support the head. A drill steel or tool 16 has the usual shank 17 and an enlargement or collar ated by similar characters p with radially disposed lugs 19 adapted to pivotally support a jaw 20. The jaw is in the form of a yoke or bail at its inner end engaging about one side of the head 11 and provided 'with pivot ears 21 for engagement over the lugs 19. The jaw 20 is provided upon its forward end with a tool-engaging plate 22 which is slotted radially, as at 23,

to freely receive the shank of the tool. 16 beyond the collar 18. This plate 22 1s spaced forwardly from the head 11, and when applied to the tool 16, permits of the free viplate 22 extends toward the closed side of the yokes of the jaw, and is thus releasable from the tool by the swinging outwardly and forwardly of the jaw. p

In Figs. 1, 2 'and'3 of the drawi there is shown a bail lock for securing t e 'aws in closed position. upon the tool. The 'ead 11 is provided with a bail 24 which has collars 24 on its ends mounted to slide and tilt on the rods 12 at the opposite side of the head 11 adjacent to the cars 13 thereof. The bail 24 is-adapted to extend around the head 11 and over the yoke of the jaw 20, and

is provided at its intermediate portion with a finger loop 25 for swinging the bail and binding the latter over a lip or, projection 26 which extends outwardly from the aw 20. The bail 24' is adapted to hold the aw 20 from swinging about the pivot lugs 19. Any attempt to withdraw the tool 16 from the head 11, causes the shank 17 to slide out- ,Wardlv from thesocket in the head 11, and

the collar 18 to bind against the retaining plate 22. The slot 23 is of a size whlch loosely receives tool 16 therethrough, but which is of less width than thediameter of the collar 18. Pressure u on the tool 16 is transmitted through plate to the p ivot'1 9 of the jaw 20, and the retaining ball 24 is relieved of all strain incldent to pressure placed upon the tool. The jaw, 20, therefore, will not become accidentally unlocked or free the tool during the vibration of the machine. 7

In Figs. 4 to 8, inclusive, there isshown a slightly modified form of jaw, and a modified form of locking means therefor. The jaw 20, as shown in Fig. 7, is of substantially the same general form as shown 1n Figs. 1, 2 and 3. The inner end of the jaw 20 is provided with a slot 27 in each side, the slots opening at their forward ends through theedges of the jaw. Intermediate the ends of the jaw 20, and in the OPPOSltG- sides thereof,are rovided slots 28 closed at their opposite en s and arran d in longitudinal alinement with the s 0t 27.- The pivot lugs 19 of the head 11 are adapted for pivot lugs 19. bration of the same. The slot 23 of the the folded end of the head 11.

ends of the formed throu h the outer ends of a pair of' engagement in the closed slots 28 andretaining lugs 29 are arranged at the opposite 1 sides of the head 11 for engagement in the vantage in Fig. 4. The jaw 20'! is adapted to he slid forwardly upon the head 11 to dispose the lugs 19 and 29 in the rear end of the slots 27 and 28, as shown in Fig. 5.;

When in thisposition,

the retaininglugs 29 hold the jaw 20 from swinging about the The jaw 20"is.provided at its inner end, and intermediate the edges thereof, with a locking latch, the same comprising a relativelybroad thumb lever 30 pivoted .at its inner end upon a transversely 'exten 0 pin 31 and provided upon its inner side lug .or bolt 32. As shown in Fig. 4, this locking latch is adapted to. be tilted outwardly from'the adjacent side of the head 11 to permit of the free sliding movement of the'jaw 20 into and out of closed posiwith a tion. When the jaw 20 is moved into the osition shown in Fig. 5, the thumb lever 30 is adapted to be swung down through a slot 33 formedinthe rear edge of the jaw 20", and to engage in a depression .or recess 34 formed in the adjacent side of the head.

From Fig. 5it will benoted that the thumb lever 30 1s prevented from swinging down into engagement with the head, and the bolt v32 is inchned'rearwa'rdly at a slight angle and is of greater length than the depth of the slot 34. Thislatch is adapted to bind frictionally in this position andt'o thus re- .tain the jaw 20 fromswinging or sliding out of engagement with the tool. In Fig. 5 there is shown the relative length of the shank 17 of the'tool, and the dlstance between the retaining plate 22 of the jaw and Suflicient space is left' betweei'f'the plate 22- and the head to permit of the free vibration of the tool when in use.

In the, form of the present. invention.

which is shown in Figs. 9, 10 and 11, the features of thisinventlon are shown as applied to the ordinary spring muzzle which is at presentusually furnished as a part of drilling'engines. In this instance, t e pivoted jaw is made up of the usual yoke 35- which engages the shank of the tool 16. The

yoke 35 pass through eyes 36 vided with helical springs 37 engaging the eyes 36 and held thereagainst by adjustable retaining nuts 38. The plates or clevises 37 form the opposite sides of the pivoted jaw, and are held in engagement with the retaining lugs 29 by the springs 38 which at all times urge the plates 37 forwardly, and particularly when the collar 18 of the tool engages the yoke 35. With this construction it is thus seen that the harder the tool binds against the yoke 35, the tighter, through the lugs 29 locks the pivoted jaw from turning. This construction differs from the usual spring muzzle employed in that the yoke 35 is held in position upon the tool only by reason of its extensive mounting on the head 11, and when the drilling engine is turned to space the yoke 35 downwardly, it frequently becomes disengaged from the tool under the vibrating ac tion thereof.

In Figs. 12, 13 and 14, there is shown a modified arrangement of the lugs at the opposite sides of the head 11. sired to apply the improvements of the presentinvention to stock machines which are not provided with the pivot lugs 19 or the retaining lugs 29, the devices of Fig. 12 may be employed. Surrounding each rod 12, at the side of the head 11, is a sleeve 40.

' The upper end of the sleeve 40 is adapted to engage about the ear 13, and is open at its inner side so as to fit snugly about the ear. The lower end of the sleeve 40 is open at its outer side and is adapted for engagement against the head 11, providing a relatively small space or slot 41 between the sleeve and the head. The inner closed side of the sleeve 40, the lower end'of the sleeve, is provided with spaced lugs 19 and 29. These lugs are of such length that at their free ends they bear against the adjacent side of the head 11, and serve the dual purpose of pivotally supporting the retaining jaw of this invention, and of also looking the same when in closed position. The sleeves 40 are of such internal diameter that they freely receive the springs 14 therein, and permit of the adjustment of the springsby the turning of the nut's'usually employed'upon the outer ends of the rod 12. Within the upper ends of the sleeves 40 are collars 40 adapt ed to embrace the rods 12 between the ears 13 and the adjacent ends of the spring 15 to hold the sleeves 40 in lace. A preferably metal strap 42 is passe around the side of the head 11 and 1s secured at its opposite ends to the sleeve 40 for retainin the same from lateral displacement from t e head.

It is of course understood that various, other changes and modifications may be made in the structure. contemplated by the present invention without departing from Where it is de the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

I claim:

1. A tool retainer for drilling en ines comprising a jaw pivoted upon the ront head of the drilling engine and adapted to engage about a tool to hold the tool in said head, and a locking member between said front head and said jaw adapted to engage the latter and retain it in engagement with the tool. i

2. In a drilling engine, the combination with the forward head of the drillin .engine, of a yoke engaging about one 'si e of said head and having a forwardly projecting portion slotted to receive the shank of a tool therethrough, a pivotal support for the yoke carried upon said head, said yoke be ing adapted to be swung about said support to engage and disengage the forward end thereof with the tool, and a locking member carried by the head adapted to engage the yoke when swung into engagement with the tool to hold the yoke from disengagement therefrom. i

3. In drilling engines, the combination with a head having pivot lugs at its opposite sides, a yoke engaging about one side of said head and having pivot ears engaging said lugs to pivotally support the yoke, said yoke having a forwardly projecting portion in cluding a plate provided with a slot extending radially in one direction to receive the shank of a tool therethrough, the slot opening toward the closed side of the yoke and adapted to release the tool upon the swinging of the yoke away from the Side of the head, and locking means carried by the head and engaging the yoke when the latter is swung into engagement with the tool, to hold the oke against displacement by vibration of the machine.

4. In drilling engines, the combination with a head, a jaw pivoted upon said head and adapted for engagement at its outer end with a drill steel, said jaw provided upon its inner end with an outwardly extending lip, and a bail hinged upon said head and adapted for interlocking engagement with said lip to retain the jaw from swinging out of engagement with the tool.

5. In drilllng engines, the combination with a head, a jaw plvoted on said head and adapted for engagement at one end with a drill steel to retain it in the head, said jaw having a projection upon its opposite end, a bail hinged u on said head inwardly of said jaw, and a apted for engagement over lil i said projection to hold the jaw from tilting out of engagement with the tool.

WALMAO E. EDWARDS. 

